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My Imac27 3.06 GHz Intel Core 2 Duo OS10.6.8, is overheating I downloaded IStat Pro to monitor the temps. I then downloaded smcFanControl 2.2.2. When I tried to open the fan control nothing happened. I tried dragging the Icon from the applications folder to the trash to uninstall and to try again to download and install it but I get a message that says it can't be moved to the trash because it's open. I can't find where it is to close it. It doesn't show up in the menu and when I go to force quit, it's not on the list.

The fact that your machine is on for you to get the reading proves it is NOT overheating, you are just over-reacting. I really wish I understood why people think that Apple has "forgotten" to provide for cooling in their otherwise superbly-engineered machines. It's sheer madness to imagine that they didn't think of it or provide for it. Must come from stupid Windows machines, that's the only explanation I can come up with.

If your iMac were, in fact, overheating, it would SHUT DOWN. Is it doing that?

Using a toy like SMC Fan Control will in fact MASK any real problems, override the engineering design and may in fact CAUSE problems as likely as it is to "solve" anything. I would discontinue using it immediately.